Note that you'd need to update guest additions also.
Also note that wpf-based applications (including powershell_ise) work correctly with Composited desktop (Aero theme) switched ON in guest.
This is a known issue and we have to postpone fixing it until some more critical issues are solved.

Let me know whether it solves the crash for you, and whether powershell_ise now works OK for you with Aero enabled.